Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-09T07:11:06.283Z Has data issue: false hasContentIssue false
  • English
  • Français

Kegelite: infrared spectroscopy and a structural hypothesis

Published online by Cambridge University Press:  05 July 2018

R. S. W. Braithwaite
R. S. W. Braithwaite*
Affiliation:
Chemistry Department, University of Manchester Institute of Science and Technology, Manchester M60 1QD, England
Get access Rights & Permissions [Opens in a new window]

Abstract

The infrared spectrum of kegelite has been measured and is discussed. The infrared spectra of 1 : 1 molar mixtures of leadhillite with pyrophyllite or with muscovite resemble the spectrum of kegelite, the chemical formula of which is a 1 : 1 stoichiometric sum of those of pyrophyllite and of the leadhillite polymorphs. Kegelite is not a physical mixture of these species, but its structure may be an interlayering of phyllosilicate and leadhillite-like structures within the unit cell. The unit cell parameters of pyrophyllite-1Tc and the leadhillite polymorphs are compatible with each other and can be combined to give a cell with parameters close to those of the kegelite cell. A structural model for kegelite on these bases is suggested, which is also consistent with its thermal analysis. The formula of kegelite can be written as Pb8(SO4)2(CO3)4(OH)4(AlOH)4(Si4O10)2.

Keywords

kegeliteinfrared spectrumpyrophylliteleadhillite
Type
Research Article
Information
Mineralogical Magazine , Volume 55 , Issue 378 , March 1991 , pp. 127 - 134
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Dunn, P. J., Braithwaite, R. S. W., Roberts, A. C., and Ramik, R. A. (1990) Kegelite from Tsumeb, Namibia: a redefinition. Am. Mineral., 75, 702–4.Google Scholar
Farmer, V. C. (1974) In The infrared spectra of minerals. Mineralogical Society, London, 331–63.CrossRefGoogle Scholar
Gruner, J. W. (1934) The crystal structures of talc and pyrophyllite. Zeits. Kristallogr., 55,412–19.Google Scholar
Hayase, K., Dristas, J. A., Tsutsumi, S., Otsuka, R., Tanabe, S., Sudu, T., and Nishiyama, T. (1978) Surite, a new Pb-rich layer silicate mineral. Am. Mineral, 63, 1175–81.Google Scholar
Hertzberg, G. (1945) Molecular spectra and molecular structure. 2. Infrared and Raman spectra of polyatomic molecules. Van Nostrand, New York.Google Scholar
Highcock, R. M., Smith, G. W., and Vickers, M. E. (1984) On the structural relationship between two polymorphs of Pb4SO4(CO3)2(OH)2, also Susannite. Acta Crystallogr., A40, supplement p. C-249, Abstract 084–17. Poster display, International Union of Crystallography meeting, Hamburg.CrossRefGoogle Scholar
Lee, J. H. and Guggenheim, S. (1981) Single crystal X-ray refinement of pyrophyllite-lTc. Am. Mineral., 66, 350–7.Google Scholar
Livingstone, A., Ryback, G., Fejer, E. E., and Stanley, C. J. (1987) Manheddleite, a new mineral of the apatite group from Leadhills, Strathclyde region, Scotland. Scott. J. Geol., 23, 1–8.CrossRefGoogle Scholar
Medenbach, O. and Schmetzer, K. (1976) Kegelitea new lead silicate from Tsumeb. Neues Jahrb. MineraL, Mh., 110–13.Google Scholar
Milodowski, A. E. and Morgan, D. J. (1984) Thermal reactions of leadhillite, Pb4SO4(CO3)2(OH)2 . Clay Minerals, 19, 825–41.CrossRefGoogle Scholar
Morgan, D. J., Warne, S. St. J., Warrington, S. B., and Nancarrow, P. H. A. (1986) Thermal decomposition reactions of caledonite and their products. Mineral. Mag., 50, 521–6.CrossRefGoogle Scholar
Nakamoto, K. (1978) Infrared and Raman spectra of inorganic and coordination compounds. 3rd ed. John Wiley and Sons, New York.Google Scholar
Povarennykh, A. S., Keller, P., and Kristiansen, R. (1982) Infrared absorption spectra of swedenborgite and queitite. Can. Mineral., 20, 601–3.Google Scholar
Ross, S. D. and Goldsmith, J. (1964) Factors affecting the infrared spectra of planar anions with D3h symmetry I. Carbonates of the main group and first row transition elements. Spectrochim. Acta, 20, 781–84.CrossRefGoogle Scholar
Russell, J. D., Fraser, A. R., and Livingstone, A. (1984) The infrared absorption spectra of the three polymorphs of Pb4SO4(CO3)2(OH)2 (leadhillite, susannite and macphersonite), Mineral Mag., 48, 295–7.CrossRefGoogle Scholar
Strens, R. J. G. (1974) In The infrared spectra of minerals (Farmer, V. C., ed.). Mineralogical Society, London, 305–30.CrossRefGoogle Scholar
Todor, D. N. (1976) Thermal analysis of minerals. Abacus Press, Kent, England.Google Scholar
Wardle, R. and Brindley, G. W. (1972) The crystal structures of pyrophyllite-1Tc, and of its dehydroxylate. Am. Mineral., 57, 732–50Google Scholar